UIGestureRecognizer - 永远不会调用reset

Question

我正在创建自定义手势识别器。问题是永远不会调用reset方法，所以我无法重置识别器的状态。因此，它仅适用于第一次

@implementation TouchGestureRecognizer {

    UIGestureRecognizerState mState;
}

-(UIGestureRecognizerState) state {
    return mState;
}

-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    if( [touches count] == 1 ) {
        mState = UIGestureRecognizerStateBegan;
    }
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    if( [touches count] == 1 ) {
        mState = UIGestureRecognizerStateChanged;
    }
}

- (void)reset {
    mState = UIGestureRecognizerStatePossible;
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    mState = UIGestureRecognizerStateRecognized;
}

@end

Answer 1

文档说明：

  

运行时在手势识别器状态设置为UIGestureRecognizerStateEnded或UIGestureRecognizerStateRecognized后调用此方法。

这似乎就是你在touchesEnded:中所做的。在这个方法中加一个断点并从那里拿走它。

Answer 2

你必须在你的.h文件中写这个。

#import <UIKit/UIGestureRecognizerSubclass.h>